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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e40ee8d3423e802b3b1417e7edc7ee6f36a205ea2c9bd52a0bf33b77b64aae6' 
  AND token = 'EDyQll9Jl0b7ocUmoslYyM9JRksc8u7cha4Nc0CAr9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}